Manufacture of dextrin.



UNITED STATES PATENT oFFIoE;

JOSEPH VERITY, STRETFORD, ENGLAND, ASSIGNOR T0 CARLO FBUA DE ANGELI, OF

MILAN, ITALY.

MANUFACTURE OF DEXTRIN.

Ho Drawing.

To all whom it may concern:

Be it known that-I, JOSEPH VERrrY, a British subject, residing at Stretford, county of Lancaster, England, have invented certain new and useful Improvements in the Manufacture of Dextrin, of which the following is a specification.

This invention relates to certain improvements in the manufacture of dextrin from farinaceous substances.

'Dextrin is at present made from corn starch,- farina, tapioca, and other farinaceous substances to which acid has been added by heating same on open trays at a temperature of say 350%. to 400 F. and the process occupies a considerable time varying from a week to a fortnight. It has also been proposed to obtain dextrin from rice or other grain by heating the same together with water and hydrochloric acid under consider able pressure.

This invention consists essentially in the use of narrow or fiat closed or sealed vessels through which the heat can readily penetrate evenly throughout the material without agitation or stirring such vessels being immersed in water or steam in tanks at or above boiling point.

In carrying out the invention I take the starch, farina, tapioca, or other farinaceous material prepared or dressed with acid in the usual Way and place the same in narrow or shallow vessels which are closed and Specification of Letters Patent.

' Patented Feb. 6, 1912,

Application filed July 12, 1911. Serial No. 638,423.

acid added to the material-the higher the temperature and the greater the quantity of acid the shorter the time in which the con version into dextrin will occupy. I do not propose to add a greater quantity of acid than is now customary. The vessels to receive or contain the material are narrow or shallow sa aboutfi inches from wall to wall to permit he heat to get at the sides, and penetrate evenly through the material and areclosed to prevent water entering. A s'eries such fiat vessels may be used. The vessels are approximately of a size of 3 8" X 3 8" x 6 inches which enables them to be easily 1nd economically handled. The lids" are bol ed on to the vessels with a suitable air tight joint.

What I claim as my invention'and desire to protect by Letters Patent is 1- 1. The process of converting farinaceous substances into dextrin which consists in I subjecting the material to heat and pressure in narrow, fiat shallow sealed vessels 'immersed intanks containing a heated liquid through which the heat can readily pene-v trate evenly throughout the mass of material Without stirring or-agitating, substantially as described. I

2. The process of converting farinaceous substances into dextrin which consists. in-

treatingthe material without agitatin' in narrow fiat or sealed vessels immers in heated liquid, the material being under considerable pressure and at a temperature at or above 212 F., substantially as described.

" In testimony whereof I have hereunto set J OWDEN OBRIEN, Gno. I. WATSON. 

